Leviticus 27:11-13

11If, however, it is any unclean animal of the kind which 1one does not present as an offering to the Lord, then he shall place the animal before the priest. 12And the priest shall assess it 2as either good or bad; as you, the priest, assess it, so shall it be. 13But if he should ever want to redeem it, then he shall add a fifth of it to your assessment.